Grabbing each other's hands, Cuoco and Panettiere were engulfed in "animated conversation," but things got even more fun once the deejay played Madonna's "Like a Prayer."

Cuoco and pals hit the dance floor, where she clapped, swayed and "was twirled by a male," the source adds. Later when Bell Biv Devoe's 1990 hit "Poison" was played, Cuoco held up her long dress while showing off a few more moves.

The actress was dancing so much that she "left the party with her heels in hand!" the source adds.
– Dahvi Shira